The solubility of NaCl(s) in water at 298 K is about 6 moles per litre. Suppose you add 1 mole of Na — Thermodynamics and Thermochemistry Chemistry Question
Question
The solubility of NaCl(s) in water at 298 K is about 6 moles per litre. Suppose you add 1 mole of NaCl(s) to a litre of water. For the reaction: $\text{NaCl(s)} + \text{H}_2\text{O} \to \text{NaCl(aq)}$
Answer: B
💡 Solution & Explanation
Since 1 mole is well below the 6 M solubility limit, it will dissolve spontaneously, making $\Delta G < 0$. The dissolution of a solid salt into mobile aqueous ions drastically increases disorder, meaning $\Delta S > 0$.
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